Cita APA

Helferich, G. (2004). Humboldt's cosmos: Alexander von Humboldt and the Latin American journey that changed the way we see the world. London: Penguin Books.

Citación estilo Chicago

Helferich, Gerard. Humboldt's Cosmos: Alexander Von Humboldt and the Latin American Journey That Changed the Way We See the World. London: Penguin Books, 2004.

Cita MLA

Helferich, Gerard. Humboldt's Cosmos: Alexander Von Humboldt and the Latin American Journey That Changed the Way We See the World. London: Penguin Books, 2004.